The Module package provides for the dynamic modification of a users’s environment via module files. Module can be used: to manage necessary changes to the environment, such as changing the default path or defining environment variables to manage multiple versions of applications, tools and libraries to manage software where name conflicts with other software would cause problems Modules have been created for many of the software packages installed on PSC systems. They make your job easier by defining environment variables and adding directories to your path which are necessary when using a given package. (Source: